一般保证的保证人与债权人未约定保证期间的，保证期间为主债务履行期届满之日起（）。 ["三个月","六个月","一年","二年"]
下面灭火方法正确的有（） ["断绝可燃物","降低着火系统的温度","稀释空气中的氧气浓度","向未切断电源的电器喷水"]
Which three statements about anycast RP are true？ （） ["MSDP is running between anycast RPs","Anycast RP provides redundancy and load-sharing capabilities","Multicast BGP is running between anycast RPs","In anycast RP，two or more RPs are configured with the same multicast IP address on loopback interfaces","In anycast RP，two or more RPs are configured with the same unicast IP address on loopback interface"]
某人投资了三种股票，这三种股票的方差一协方差矩阵如下表所示，矩阵第（i¸；j）位置上的元素为股票I与j的协方差，已知此人投资这三种股票的比例分别为0.3、0.3、0.4，则该股票投资组合的风险是（） ["9.0","8.9","12.5","9.7"]
风格主义的艺术特点？
试论菲利普斯曲线理论演变对货币政策实施的影响。
